The invention provides a biological composite oxygen producer which comprises the following preparation raw materials in parts by weight: 60-80 parts of a peroxide composition, 5-20 parts of a stabilizer, 5-15 parts of glutamine, 2-15 parts of starch slurry and 15-30 parts of a microorganism composition, wherein the peroxide composition comprises a peroxide and modified porous silicon dioxide; themodified porous silicon dioxide is a carboxymethyl chitosan modified porous silicon dioxide; the microorganism composition comprises a matrix material, sodium alginate, microorganism bacteria and modified carbon nanotubes; the modified carbon nanotubes are carbon oxide nanotubes grafted with citric acid.